Ornament for a Christmas tree



FIG. 1 is a perspective view of an ornament for a Christmas tree showing my design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof, with portions shown in broken lines forming no part of the claimed design. 

The ornamental design for an ornament for a Christmas tree, as shown and described. 